Moisture control is an essential component of creating a healthy home. From meticulous soil and grading preparation to top-notch insulation, consider any of the pro tips listed below for the most moisture-resistant home possible.

There are certain types of soil that create challenges when it comes to moisture control. For example, those with a high plasticity index. This indicates significant clay in the soil. Soils with a plasticity index over 35 are more likely to expand and contract as moisture changes, putting the foundation at heightened risk.

It is also critical to have the soil adequately graded away from the home. This limits the threat of water pooling near the foundation. The general recommendation is a 3-5% grade, with the higher end of this range more suitable for very moist climates.

Landscaping choices have a major impact on a home’s moisture resistance. Lawns that require frequent watering need to be effectively designed. Even highly efficient sprinkler and drip irrigation systems are known to go haywire, resulting in standing water on sidewalks and patio floors. In a worst-case scenario, the ground becomes over-saturated, compromising the foundation. Therefore, it is crucial to implement slot drains in high-risk areas around the home. They are incredibly low profile and help ensure that any errant water does not reach finished areas of the home or exterior.

It is also worthwhile to consider upgrading to a permeable gravel driveway. Iowa is a state known for significant annual rainfall. During a heavy summer thunderstorm, flowing precipitation can quickly runoff concrete surfaces. This threatens to erode the driveway substrate and surrounding landscape. A permeable driveway leverages the natural drainage of crushed stone. Using a series of substrate paver grids to hold surface aggregates in place, permeable gravel is the best choice for maintaining ongoing aesthetics and performance in the face of heavy precipitation.

Keeping the foundation free from moisture damage is a top concern in Iowa and other humid states. Traditionally, this has meant applying a liquid flashing to concrete foundation walls. This does an adequate job of protecting the foundation from standard soil moisture. However, it may not be enough in areas with heavy rainfall and, subsequently, high hydrostatic pressure.
A next-level option for how to waterproof a basement lies in self-adhering membranes. The simple peel-and-stick application offers a moisture-tight bond to the walls. When ground water arrives at the foundation, it passes through the membrane and is directed to a dimple drainage mat. From there, it flows into a subterranean piping system to flow away from the home, keeping the foundation truly impervious to moisture-related challenges.

Insulation is crucial for a home’s comfort and energy efficiency. However, not all products are created equal when it comes to moisture resistance. Namely, the fiberglass batt insulation common to many mass-produced homes is known to readily absorb moisture, reducing its R-value and opening the door for mold, rot, and host of other moisture-related issues in the home’s walls.

As such, the best insulation for exterior walls in terms of moisture performance is rigid polyiso board. Its closed-cell fabrication makes it impermeable to moisture absorption. Furthermore, it offers elite R-value per inch. This makes it extremely lightweight and compatible with nearly any cladding choice, helping ensure the ongoing structural integrity of the building envelope against load-bearing challenges. 

If you have additional questions about moisture protection or any other home improvement needs, contact PRK Williams Building Group for a consultation today!

Author Bio Andrea Erickson is a freelance writer who loves sharing her knowledge and expertise in renovation and Interior Design. She lives in her hometown of Austin, Texas where she enjoys spending time with her husband and decorating with her children. Andrea’s work as a freelance writer can be found on Building Product Advisor, a construction industry resource site.